RMS Lusitania .
A few events caused the US to enter the war. The main event was the sinking of the British passenger ship, the Lusitania, in May 1917. On board the ship were a number of Americans. The German U20 submarine torpedoed the ship, and withing 18 minutes the ship sunk. Less than half the people on board survived. A little bit of trivia: some people beleived the British let the Germans sink the Lusitania in order to get the US to join the war. This may be true, as the British Navy's actions before and after the event support this.
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One of the most notorious instances of a German submarine sinking a passenger ship was the sinking of the RMS Lusitania on May 7, 1915. The Lusitania was a British ocean liner that was torpedoed by a German U-boat off the coast of Ireland during World War I, resulting in the deaths of over 1,100 passengers and crew. The sinking of the Lusitania contributed to the eventual entry of the United States into the war.
It was the RMS Falaba, that went down with 104 people on 28 March, 1915. It was the first passenger ship sunk by torpedo during World War I.
Germany didn't have to torpedoed a passenger ship even if it was smuggling weapons. And the Zimmerman telegraph offered Mexico their land that they had lost and had been taken from America and this message came from Germany which made USA join the war because Germany wanted to attack them.
The Lusitania
Lusitania
The Falaba
there were several ships torpedoed in the channel, 1915 one was a ferry and the other one was the "Lusitania"
the British passenger ship called the Lusitania was sunk by a German u-boat on May 7, 1915 a couple months after Germany warned that any ship venturing through the 'war zone' would be sunk. The ship contained approximately 1200 passengers and of that 1200 passengers 128 were Americans. The British steamship Falaba was torpedoed and sunk by a German submarine on March 28, 1915, the date specified in the question, and slightly earlier than the sinking of the Lusitania on May 7, 1915.
La Provence, renamed Provence II and used for troop transport in the Mediterranean until the ship was torpedoed and sunk by the German submarine U-35.
RMS Lusitania
14th September 1939 @1415
There wasn't anything it could do. It was a British ship torpedoed by a German submarine and those two countries were at war.
President Wilsons response to the sinking of the British passenger ship Lusitania was to send diplomatic protests
Germany was afraid that America would go into war, and they were afraid of America.
German U-boats torpedoed and sank the British ocean liner Lusitania on May 7 1915.